clf;
D = load('gp_data_100');
dim = size(D);
n_class = max(D(:,dim(2)));

for c = 1:n_class
  vals = D(find(D(:,3)==c),:);
  s = strcat('@', num2str(c));
  plot(vals(:,1), vals(:,2), s);
  hold on;
end

% colours are indexed rgbmcw